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SAE-AISI S7 Steel vs. EN 1.4971 Stainless Steel

Both SAE-AISI S7 steel and EN 1.4971 stainless steel are iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is EN 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
800

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.3
7.6
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 65
300

Common Calculations

PREN (Pitting Resistance) 8.4
38
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 72
26
Strength to Weight: Bending, points 22 to 46
23
Thermal Diffusivity, mm2/s 11
3.4
Thermal Shock Resistance, points 22 to 66
19

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.080 to 0.16
Chromium (Cr), % 3.0 to 3.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
24.3 to 37.1
Manganese (Mn), % 0.2 to 0.9
0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
2.0 to 3.0
Vanadium (V), % 0 to 0.3
0